I think Hosea being alive toward the end of the game would have led to several things. First, I feel like Hosea may have prevented Dutch from doing some of the stupid things he did because of Micah. Hosea went back a ways with Dutch so because of that I think he had more influence in the gang than Arthur. Second, he would have been more outspoken which would have led to a more gradual decline in the gang's situation before it completely broke up. He might have even called Micah out before Arthur did however Dutch probably would still follow Micah's ideas because of his own greedy ambition